Gilman Guidelli & Bellow

What Gilman Guidelli & Bellow does

Gilman Guidelli & Bellow is a privately held custom residential builder founded in 1990 and headquartered in Newton, Massachusetts, serving affluent homeowners in the Boston, Metro-West, and broader New England corridor (including the North Shore, Cape Ann, and coastal Connecticut). The firm operates as a general contractor with approximately 30 craftspeople and an in-house millwork shop, delivering two distinct service lines: Big Projects (large-scale custom home builds, historic restorations, and substantial additions) and Small Projects (kitchens, baths, cabinetry, wine cellars, decks, and ongoing maintenance). Notable technical capabilities include fine finish carpentry, custom millwork, historic restoration (including LEED Silver-certified work), and integration of modern mechanical and control systems into period architecture.

The company generates revenue through fixed-fee contracts, time-and-materials-plus-fee contracts, or hybrid arrangements, with labor billed at $75/hour and materials/subcontractors carrying a 15% overhead-and-profit markup; larger projects are invoiced monthly on an open-book basis showing all receipts and hours. The go-to-market motion is relationship-driven: projects are sourced through word-of-mouth referrals, repeat clients (some spanning multiple generations), and a long-standing network of more than 11 named Boston-area architectural and design firms, supplemented by an Instagram presence (@ggbbuilds) and a documentation-rich website portfolio. GGB is owned and operated by its three partners (Gary Gilman, Richard Guidelli, and Doug Bellow) with no external institutional investment, and revenue is not publicly disclosed.

Name

Gilman Guidelli & Bellow

Legal name

Gilman, Guidelli & Bellow

Website

https://ggbbuilds.com

Company type

Private

Founded year

1990

Operating status

Operating

Headcount range

11–50 employees

Short description

Gilman Guidelli & Bellow is a Newton, MA-based custom residential builder founded in 1990, serving affluent Boston-area homeowners through large-scale custom builds, historic restorations, and small-scale renovation and maintenance services via a 30-craftspeople in-house millwork operation.

Ownership category

akta.pro rank

Product category

Custom Residential Construction

NAICS

Residential Building Construction (23611), Residential Remodelers (236118)

SIC

General Bldg Contractors - Residential Bldgs (1520), Operative Builders (1531)

akta.pro primary industry

Residential Design-Build & Renovation-Integrated Builders (IMAFABAE)

akta.pro secondary industry

Millwork & Finish Carpentry (Trim, Molding, Wainscoting) (HSAPAIAG)

Keywords

• Custom residential construction
• Historic home restoration
• Luxury home renovation
• Finish carpentry services
• General contracting

Headquarters

HQ city

Newton

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2C

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Infrastructure, Marketing or Sales, Others

Revenue model

1. Custom Residential Construction: GGB serves as the general contractor for residential construction projects, offering fixed-fee contracts, time and materials plus fee contracts, or hybrid arrangements depending on project needs. Revenue is generated through construction fees, markup on subcontractors and materials, and direct labor charges. The company engages in full-service project delivery including pre-construction consulting, construction management, and post-construction maintenance services.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels4 records

Core offering

Gilman Guidelli & Bellow is a custom residential builder providing comprehensive construction services for high-end homeowners, acting as general contractor on projects ranging from new custom home builds and historic restorations to major additions and small renovations. The firm manages all project phases from pre-construction consulting through post-construction maintenance with its own staff of approximately 30 craftspeople and an in-house millwork shop, serving the Boston and Metro-West Massachusetts area.

Product overview

Gilman Guidelli & Bellow is a custom residential builder operating in the Boston, MA metro area, offering two primary service lines: Big Projects for large-scale custom home builds and major renovations, and Small Projects for targeted renovations, repairs, and ongoing maintenance. The company manages projects from pre-construction through completion, acting as general contractor with its own staff of carpenters. Big Projects include historic restorations, new constructions, and substantial additions, while Small Projects encompass kitchens, baths, cabinetry, wine cellars, decks, and seasonal maintenance. The company also offers trade partnerships for subcontractors and employment opportunities for skilled craftspeople.

Differentiator

Problem solved

Functional benefit

Products and services

• Big Projects Large-scale custom residential construction offering including new custom home builds, substantial renovations, historic restorations, and major additions, managed as general contractor with comprehensive pre-construction, construction, and post-construction services. Contracted via fixed-fee, time-and-materials plus fee, or hybrid arrangements with monthly open-book billing.
• Small Projects Smaller-scale residential renovation, repair, and maintenance services for fine homes including kitchens, baths, additions, cabinetry, trim, wine cellars, fitness rooms, decks, porches, hardwood floor repairs, interior and exterior painting, finished basements, and seasonal maintenance. Billed at $75.00/hour labor rate with 15% overhead and profit on materials and subcontractors.

Quantifiable outcome

• LEED Silver accreditation achieved on Seaside Restoration project
• +1 more outcomes

Named customers6 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

14 partnerships are on record, tiered core, major and minor.

• Steve Hart (Hart Associates Architects)coreStrategic or Co-development PartnerLong-term collaborative relationship on residential construction projects. Steve Hart has been involved in multiple GGB projects including Victorian Eclectic Cambridge and Riverside Penthouse Cambridge, serving as architect on these sophisticated renovations.
• LDA Architecture & InteriorscoreStrategic or Co-development PartnerOngoing partnership on residential projects including Shingle Style Newton and Cook's Kitchen Hingham. LDA provides both architectural and interior design services for GGB construction projects.
• Siemasko + VerbridgecoreStrategic or Co-development PartnerFeatured on multiple significant projects including Seaside Restoration Marblehead and Victorian Restoration Cambridge. The firm provides architecture, interior design, and landscape architecture services.
• Anmahian Winton ArchitectscoreStrategic or Co-development PartnerCollaborated on Contemporary River House Westport and Modern Addition Newton projects, providing architectural services for modern residential designs.
• Huth ArchitectscoreStrategic or Co-development PartnerPartnership on Art Loft Cambridge and Gardenside Penthouse Boston projects, providing architecture and interior design for modern urban renovations.
• LeBlanc Jones Landscape ArchitectsmajorStrategic or Co-development PartnerRegular landscape architecture partner on GGB projects including Shingle Style Newton, Greek Revival Concord, and Courtyard House Cambridge.
• C&J Katz StudiocoreStrategic or Co-development PartnerRepeat partnership on multiple projects including Victorian Addition Newton, Back Bay Apartment Boston, SOWA Condo Boston, and Modern Walk Up Charlestown. Provides architecture and interior design services.
• Estes Twombly ArchitectsmajorStrategic or Co-development PartnerFeatured on River Cottages Westport and New England Modern Hingham projects, providing architecture services for residential construction.
• Matthew Cunningham (Landscape Architect)majorStrategic or Co-development PartnerProvided landscape architecture for Victorian Eclectic Cambridge project, creating private pastoral haven in Harvard Square.
• Nate Berkus (Interior Designer)coreStrategic or Co-development PartnerCollaborated on Victorian Eclectic Cambridge project, bringing interior design expertise to create a personal space for the young family homeowners.
• Reed Hilderbrand Landscape ArchitectsmajorStrategic or Co-development PartnerLandscape architecture partner on River Cottages Westport and Contemporary River House Westport projects.
• Oblio Design (Diane Cramphin)majorStrategic or Co-development PartnerInterior designer featured on multiple GGB projects including River Cottages Westport, Basement Wine Cellar Newton, and Contemporary River House Westport.
• CBA Landscape Architects (Clara Bachelor)majorStrategic or Co-development PartnerLandscape architecture partner on Riverside Penthouse Cambridge and Harbor Restoration Marion projects.
• Peter Vanderwarker PhotographyminorStrategic or Co-development PartnerProfessional photographer whose work documents GGB projects including Shingle Style Newton, River Cottages Westport, and Family Library Winchester.

Scale indicators3 records

Recent moves7 records

Expansion highlights8 records

Broad incumbents

• Toll Brothers: National luxury homebuilder with a move-up and luxury segment. Serves the same affluent end-customer as GGB but at production scale and standardized product, making it a broad incumbent in luxury residential rather than a direct custom-build competitor.
• PulteGroup: National homebuilder with multiple brands spanning entry-level to luxury (including Del Webb and John Wieland). Overlaps GGB only at the high-end of its portfolio and operates at vastly greater scale.
• Suffolk Construction: Boston-headquartered general contractor operating across commercial, institutional, and select high-end residential work. Operates at much greater scale and breadth than GGB but competes for premium local talent and project visibility in the Boston market.

Direct peers

• Sea-Dar Construction: Boston-area custom home builder specializing in luxury new construction, major renovations, and historic restoration — overlapping GGB's project types and high-end client segment.
• Thoughtforms Corporation: Boston-area custom residential builder focused on high-end homes, renovations, and additions for affluent clients. Closest direct comparable in scale, service mix, and Boston metro geography to GGB.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• Instagraminstagram.com/ggbbuilds

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Gilman Guidelli & Bellow